A study of the 78, 76Se(p, t)76, 74Se reactions at Ep = 33 MeV

doi:10.1016/0375-9474(77)90391-8

Nuclear Physics A

Volume 284, Issue 3, 11 July 1977, Pages 379-398

https://doi.org/10.1016/0375-9474(77)90391-8 Get rights and content

Abstract

The ^{78, 76}Se(p, t)^{76, 74}Se reactions have been studied at a proton energy of 33 MeV using detector telescopes and particle identification techniques. Twenty-eight states up to an excitation energy of 4.64 MeV in ⁷⁴Se and twenty-five states up to 4.43 MeV in ⁷⁶Se were observed, many for the first time. Angular distributions were measured for many of these states from 15–90° and the results compared with standard zero-range DWBA calculations. Many new J^π assignments were made on the basis of the DWBA calculations and a comparison of the angular distributions with the empirical shapes of transitions to states with well-known J^π. In particular, two excited O⁺ states were observed in each nucleus with the strength of the O₂⁺ state in ⁷⁴Se being enhanced relative to the ground state by a factor of six as compared to the O₂⁺ states in the other Se isotopes. Enhancement coefficients were calculated for simple two-neutron pickup configurations.

References (29)

J. Barrette et al.
Nucl. Phys.
(1974)
N.E. Sanderson
Nucl. Phys.
(1973)
N.E. Sanderson et al.
Nucl. Phys.
(1976)
S.L. Heller et al.
Phys. Rev.
(1974)
S.L. Heller et al.
Phys. Rev.
(1975)
E.K. Lin
Nucl. Phys.
(1965)
E. Hentschel et al.
Nucl. Phys.
(1970)
J. R. Comfort, Argonne National Laboratory Informal Report PHY-1970B,...
P. D. Kunz, University of Colorado, 1967,...
T. Udagawa
Phys. Rev.
(1974)
G.C. Ball et al.
Nucl. Phys.
(1974)
D. W. Gebbie, K. A. Aniol, C. L. Hollas, M. Borsaru, J. Nurzynski and L. O. Barbopoulos, to be...
K.W.C. Stewart et al.
Nuovo Cim. Lett.
(1970)

G. Holzwarth et al.

Z. Phys.

(1972)

S.G. Lie et al.

Phys. Rev.

(1975)

R.M. Lieder et al.

Phys. Rev.

(1970)

E. Nolte et al.

Phys. Lett.

(1970)

W.G. Wyckoff et al.

Phys. Rev.

(1973)

M.L. Halbert et al.

Nucl. Phys.

(1976)

R.B. Piercey et al.

Phys. Rev. Lett.

(1976)

C. Protop et al.K.O. Zell et al.

Z. Phys.

(1975)

M. Behar et al.

Nucl. Phys.

(1976)

L. O. Barbopoulos, D. W. Gebbie, J. Nurzynski, C. L. Hollas, M. Borsaru and K. A. Aniol, to be...

Cited by (20)

Nuclear Structure and Decay Data for A=76 Isobars
2024, Nuclear Data Sheets
The experimental nuclear spectroscopic data for known nuclides of mass number 76 (Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y) have been evaluated and presented together with Adopted properties for levels and γ rays. With the exception of structure data for ⁷⁶Ga nucleus, significant new data have been incorporated for all the other nuclides of A=76 since the previous 1995 update in ENSDF database and NDS publication 1995Si03. No data are yet available for excited states in ⁷⁶Fe, ⁷⁶Cu and ⁷⁶Y. Decay scheme characteristics for the decay of ⁷⁶Co, ⁷⁶Ni, and ⁷⁶Y are unknown while those for decays of ⁷⁶Cu and ⁷⁶Sr seem incomplete. For ⁷⁶Ni, very little structure data are available, and for ⁷⁶Ga and ⁷⁶As, only low-spin ( $J < 4$ or so) information is available. This work supersedes the data presented in the previous (1995Si03) NDS evaluation of A=76.
Nuclear Data Sheets for A = 74
2006, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 74 (Co,Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr, Rb,Sr) with Z = 27 to 38 and N = 47 to 36 have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No excited state data are yet available for ⁷⁴Co, ⁷⁴Cu and ⁷⁴Sr. This evaluation supersedes previous full evaluations of A = 74 by 1987Si08 and 1976Ko07, and a midstream evaluation (published in update mode) by 1995Fa23 with a literature cutoff date of May 1994. Extensive new data have been included for most nuclides in the current revision of A = 74.
Decay of <sup>76</sup>As
1998, Applied Radiation and Isotopes
The level structure of ⁷⁶Se has been investigated by studying the γ-rays emitted following the β⁻ decay of ⁷⁶As. The energies and relative intensities of 45 γ-rays have been determined with a better overall precision than previously. Two new transitions with 528.2 and 1232.4 keV have been found and placed in the level scheme. A new level, at 1791.5 keV excitation energy, is proposed. Seven transitions and three levels previously attributed to this decay scheme were not confirmed.
Microscopic description of low-lying states in even Ge and Se nuclei
1988, Nuclear Physics, Section A
The Hartree-Fock-Bogoliubov approach with spin and number projection before the variation extended to the description of nonyrast states (EXCITED VAMPIR) is used to describe simultaneously many properties of the ^68,70,72,74Ge and ^72,74Se nuclei. Low-lying spectra, neutron and proton occupation numbers for the spherical-basis orbitals, E0 and E2 transitions, and quadrupole moments are calculated and a fairly good agreement is obtained with experiment. The analysis of the EXCITED VAMPIR mean fields reveals that a strong mixing of prolate and oblate intrinsic quasiparticle determinants is responsible for the complex behaviour of the nuclei in A=70 region.
Nuclear data sheets for A = 74
1987, Nuclear Data Sheets
Nuclear Data Sheets for A=76
1984, Nuclear Data Sheets
The 1976 version of A=76 mass chain (76Be41) has been revised. Nuclear spectroscopic information for known nuclides of mass number 76 (Zn, Ga, Ge, As, Se, Br, Kr, Rb) has been evaluated and presented together with adopted level energies, level Jπ's and γ-rays in these nuclei. No data are yet available for excited states in ⁷⁶Zn and ⁷⁶Rb. Levels in ⁷⁶Ga are known only from a tentative level scheme from ⁷⁶Zn decay.
High spin levels and band structures are known for ⁷⁶Se, ⁷⁶Br, and ⁷⁶Kr from (HI,xnγ) reactions.

View all citing articles on Scopus

^†: Present address: CSIRO Division of Mineral Physics, Port Melbourne, Victoria, Australia.

^††: Present address: Department of Physics, Royal Military College, Duntroon, ACT, Australia.

^†††: Present address: Department of Physics and Astronomy, University of Massachusetts, Amherst Mass, USA.

View full text

A study of the 78, 76Se(p, t)76, 74Se reactions at Ep = 33 MeV

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Phys. Rev.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Nucl. Phys.

Nuovo Cim. Lett.

Z. Phys.

Phys. Rev.

Phys. Rev.

Phys. Lett.

Phys. Rev.

Nucl. Phys.

Phys. Rev. Lett.

Z. Phys.

Nucl. Phys.

A study of the ^{78, 76}Se(p, t)^{76, 74}Se reactions at E_p = 33 MeV